When you notice that he is getting a little less enchanted with it, just move it to another area of the tank or turn it in a different direction and you will be surprised. It will be just like it is a new toy all over again. They do not take much to make it a whole new thing. This is why Dave gets the long snakey like air wands that bend. He can bend them in new shapes every time he does a
water change and the bettas think they have a new playground. Or if you lay something over on its side that he has been used to having standing up it will have him going for sure. They can spend hours investigating a new change in the decor and all you have to do is move the things that were already there. They are funny fish for sure. But they have to make sure you really haven't put something in there they haven't seen yet...
Rose